admin: completeness + UI consistency pass

Arcadia wiring:
- home: real Overview dashboard (tenants/users/audit/health probe) replacing the inherited Vibespace welcome tiles; skeleton loaders, refresh button, registers admin context
- profile: split into Account (synced via getUser/updateUser of session user) and local Preferences; updateSessionUser keeps the appbar in sync after edits
- session: drop unused signIn mock, add updateSessionUser, refresh tests
- profile schema: drop redundant Profile.name/email (session is the source of truth)
- routes: delete orphaned resources route + lib

Auth flows that previously 404'd:
- /signup, /login/forgot, /login/reset, /login/2fa wired via @crema/arcadia-auth-ui
- shared AuthShell + AuthBrand wrapper

Assistant tools (admin-tools.ts):
- +10 tools: deactivate_tenant, set_user_status, delete_user, list_memberships, list_roles, revoke_api_key, create_user, update_user, assign_role, remove_role
- list_memberships gains user_id filter for "tenants this user belongs to" queries
- search_kb / read_chunk: new token resolution (window override → VITE_ARCADIA_SEARCH_TOKEN service token → operator session JWT → "dev"); on 401/403 emit a tailored hint based on which token was used

UI consistency:
- new PageHeader component
- AppShell.title was unrendered — dropped; first-child padding on #main-content keeps the floating actions pill from colliding with header content
- removed dead "Sign in required" fallback cards from 14 routes (AppShell already redirects)
- stripped p-6 from outer wrappers across 14 routes (was double-padding under AppShell's own p-6)
- migrated home + tenants to PageHeader

arcadia-search ergonomics:
- scripts/mint-search-token.mjs + `npm run mint:search-token` mints HS512 JWT with required tenant_id claim, upserts VITE_ARCADIA_SEARCH_TOKEN into .env.local
- README/.env document the new VITE_ARCADIA_SEARCH_URL / VITE_ARCADIA_SEARCH_TOKEN knobs
- .env.local now gitignored

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/routes.ts

@@ -2,7 +2,6 @@ import { type RouteConfig, index, route } from "@react-router/dev/routes"
 
 export default [
   index("routes/home.tsx"),
-  route("resources", "routes/resources.tsx"),
   route("activity", "routes/activity.tsx"),
   route("assistant", "routes/assistant.tsx"),
   route("ai", "routes/ai.tsx"),
@@ -10,6 +9,10 @@ export default [
   route("settings", "routes/settings.tsx"),
   route("profile", "routes/profile.tsx"),
   route("login", "routes/login.tsx"),
+  route("login/forgot", "routes/login.forgot.tsx"),
+  route("login/reset", "routes/login.reset.tsx"),
+  route("login/2fa", "routes/login.2fa.tsx"),
+  route("signup", "routes/signup.tsx"),
   route("tenants", "routes/tenants.tsx"),
   route("storage", "routes/storage.tsx"),
   route("users", "routes/users.tsx"),